diff --git a/Mediapipe.Net/Native/UnsafeNativeMethods/External/Stdlib.cs b/Mediapipe.Net/Native/UnsafeNativeMethods/External/Stdlib.cs
new file mode 100644
index 0000000..55f813e
--- /dev/null
+++ b/Mediapipe.Net/Native/UnsafeNativeMethods/External/Stdlib.cs
@@ -0,0 +1,25 @@
+// Copyright (c) homuler and Vignette
+// This file is part of MediaPipe.NET.
+// MediaPipe.NET is licensed under the MIT License. See LICENSE for details.
+
+using System;
+using System.Runtime.InteropServices;
+
+namespace Mediapipe.Net.Native;
+
+internal partial class UnsafeNativeMethods : NativeMethods
+{
+    [DllImport(MEDIAPIPE_LIBRARY, ExactSpelling = true)]
+    public static extern void delete_array__PKc(IntPtr str);
+
+    #region String
+    [DllImport(MEDIAPIPE_LIBRARY, ExactSpelling = true)]
+    public static extern void std_string__delete(IntPtr str);
+
+    [DllImport(MEDIAPIPE_LIBRARY, ExactSpelling = true)]
+    public static extern MpReturnCode std_string__PKc_i(byte[] bytes, int size, out IntPtr str);
+
+    [DllImport(MEDIAPIPE_LIBRARY, ExactSpelling = true)]
+    public static extern void std_string__swap__Rstr(IntPtr src, IntPtr dst);
+    #endregion
+}